package package_demo;

public class Student_main {
    public static void  main(String[] args){
        //通过类加载器class loader加载student类.加载后，方法区中就有了Studdent类的信息
        Student s = new Student();
        s.name = "张哲";
        s.student();

        Student s1 = new Student();
        s1.age = 18;
        s1.student();
    };
}
